Trump on Monday blocked Broadcom’s effort to buy Qualcomm on national security grounds, ending what would have been the technology industry’s biggest deal ever amid concerns that it would give China the upper hand in mobile communications.

“President Trump and his administration made the right decision on blocking Broadcom from taking over Qualcomm,” Senate Democratic Leader Chuck Schumer said in a speech on the Senate floor.

“We all know that China has been rapacious about trade and very smart. They look for places where they can steal our best technology,” Schumer added.